Relax Sauna review

The short version: the Relax Sauna is a reflective tent over a folding chair with two far-infrared radiators sitting under your feet, rated at 1,400 W, published at 140 to 170 °F, with a stated emission band of 7,000 to 14,000 nm. The Black Pro and Silver Elite are the same technology with different tent material; the Flex is a lie-down version at 800 W with one radiator. It is made in Taiwan and distributed in North America by Momentum98. The warranty is one year. The published EMF figures do not agree with each other.

The range, as Relax publishes it

The design is genuinely different from a cabin or a blanket. Two radiators with fans sit below the feet and fire upward into a mirror-lined tent, rather than panels surrounding you at torso height — Momentum98 describes 40 patented ceramic semiconductor chips across the two units, with a thermostat that modulates current as the chamber heats. The chair carries up to 350 pounds and the whole thing folds into a bag in a few minutes, which is the practical argument for it over a cabin. Our best portable saunas page covers the alternatives, and infrared sauna vs sauna blanket covers the format question.

The EMF numbers, which contradict each other

Relax publishes a measured figure with a stated distance, which is more than most of this category does: a maximum of 46.510 mG at 2 centimeters from the heater, compared on the same page against an occupational exposure limit of 10,000 mG. Its EMF page then states that less than 0.5 mG is detected anywhere your body sits inside the sauna, that the sauna measures 0.17 to 0.9 mG, and that readings on the chair average 0.7 mG, while citing a Swedish guideline of 2 mG or less at 30 centimeters.

Those figures are reconcilable — 46.5 mG at 2 centimeters from a radiator and under 1 mG at seat height are not inconsistent, because magnetic fields fall off fast with distance. What is not reconcilable is the wording: a blanket claim of under 0.5 mG anywhere your body sits, on a product whose radiators sit directly under your feet. Nothing on the site names the meter, the lab, the operator or the date for any of these readings, and the 10,000 mG comparison is an occupational limit rather than a residential one, used alongside the far stricter 2 mG figure on a different page. Our what is low EMF page explains why distance is the whole argument.

The comparison table, and how to read it

Relax publishes a comparative analysis putting its own radiant flux at 0.518 to 2.063 W and power density at 5.18 to 20.63 mW/cm² at 20 cm, against a full-spectrum competitor and an unnamed Amazon sauna, plus emissivity figures to two decimal places. No test method, instrument, laboratory or identification of the competing units is given, and the 20 W/m² medical standard it cites is not attributed to a standards body or document. Treat the table as a vendor's own comparison rather than independent measurement — the numbers may well be right, but nothing published lets you check them.

One more distinction the marketing blurs: Momentum98 states that the Sky Eye Radiator, which uses the same underlying technology, has a 510(k) number from the FDA designating it a medical device. That is a statement about the Sky Eye lamp, not about the Relax Sauna itself.

Warranty and returns

• One year, with free replacement or repair, on all three models.
• A 30-day money-back guarantee is the headline — and the policy behind it runs from the shipping date, not delivery.
• Unopened returns are refunded minus shipping and handling, with the customer paying return postage.
• Opened returns carry a restocking fee of 15 percent or $100 on saunas — $345 on a $2,300 Black Pro.
• Damage, missing packaging or excessive wear may disqualify a return, and an RMA is required first.

What is not published

• Amperage or plug type — a 1,400 W unit on 120 V draws around 12 A, but the brand does not state it.
• Warm-up time in minutes, or packed dimensions.
• Any laboratory, meter or date behind the EMF or comparative figures.
• VOC test data, despite an acknowledged initial odor and a recommended 30-minute burn-in.
• Consistent EMF wording between the FAQ and the EMF page.

What the chair format changes

Two consequences follow from radiators under the feet and a head outside the tent. The first is comfort: you breathe room air rather than hot air, which makes a 140 to 170 °F chamber tolerable for longer than the same figure in a cabin, and it is the reason people with low heat tolerance often get on with this format. The second is coverage — heat rises past your legs and torso, and your shoulders get less of it than your calves do. Neither is a fault; both are the format. If you want your head in the heat and steam in the air, this is not the product, and our best portable steam saunas page covers the tents that do that instead.

Buying: distributor, resellers and stock

Relax is unusual in this category for selling through Amazon at all, and the storefront belongs to Momentum98, which the brand names as its North American distributor — so the Amazon route is not a gray-market one. It matters because stock moves between channels: every model on the brand's own store was listed sold out when we read it, while the Amazon listings were in stock. Other sellers exist online for the same units, and a one-year warranty administered by whoever sold it to you is a reason to buy from the distributor rather than the cheapest listing.

Who this is for

This suits someone in a small or rented space who wants far infrared with no assembly, no circuit work and the option to put it away — and who is comfortable sitting in a chair rather than lying down or sitting on a bench. It is a poor fit if you want a hot enclosed room, if you need the heat to reach your back as directly as your legs, or if you want the EMF case to be documented. The picks below start with Relax's own Amazon listings and then show the blanket and tent alternatives in the same money.

Every pick on this page comes from published specifications, not from hardware we own. Read how we pick — including what spec-led ranking cannot tell you.